Loading question...
You are in free guest mode. Timed Practice Revision List Attempt History Progress Tracking Create a free account to unlock these tools
Back to Questions
Next
Practice Listening: Highlight Correct Summary ID: #47330 Medium Telescopes
Instructions ›
You will hear a recording. Click on the paragraph that best relates to the recording.

Transcript:

The aperture of a telescope is several times larger than the aperture of the human eye, so that the objects that cannot be normally seen by the unaided eye can be seen. Light gathering power of a telescope is proportional to the area of its aperture, and hence depends on the square of the radius of the mirror. Therefore, a 20 centimeter diameter telescope collects four times more photos than a 10 centimeter diameter telescope. A telescope can be equipped to record light over a long period of time by using photographic film or electronic detectors, such as photometers or CCD detectors, while the eye has no capability to store light. A long exposure photograph taken through a telescope reveals objects too faint to be seen with the eye, even by looking through the same telescope. A third major advantage of large telescopes is that they have superior resolution, the ability to discern fine detail. Small resolution is good. The resolution is directly proportional to the wavelength being observed and inversely proportional to the diameter of the telescope.
* Click on the correct answer

Result:

AI explanationShows the answer. Tap to open.
Option 3: "Telescopes which have light-gathering power and proportional to the area of its aperture depends on the square of the radius of the mirror. Telescopes also have a superior resolution. A Telescope is several times larger than the aperture of human eye."

Explanation: This option accurately summarizes the main ideas of the text. It highlights the light-gathering power of telescopes, which is proportional to the area of the aperture and depends on the square of the radius of the mirror. It also mentions the superior resolution of telescopes and correctly states that telescopes have apertures several times larger than the human eye, capturing the essence of the text.

Option 1: "The objects that can not be normally seen by unaided eye can be seen by a telescope. Hence, a small resolution is good."

Explanation: This option incorrectly states that 'small resolution is good,' which contradicts the text. The text emphasizes that superior resolution is a major advantage of telescopes, not small resolution. Additionally, while it mentions that telescopes can see objects not visible to the unaided eye, it fails to capture the broader context of light-gathering power and the advantages of telescopes.

Option 2: "Telescopes can record light over a long period while the eye cannot store light. But telescopes are not several times larger than the aperture of human eye."

Explanation: This option contains a factual error; the text states that the aperture of a telescope is several times larger than that of the human eye. While it correctly mentions that telescopes can record light over a long period, it does not summarize the main points about light-gathering power and superior resolution, making it incomplete.

Option 4: "The resolution of a telescope is directly proportional to the wavelength being observed and inversely proportional to the diameter of the telescope."

Explanation: While this statement is true according to the text, it is too narrow and focuses only on the resolution aspect without summarizing the broader advantages of telescopes, such as light-gathering power and the ability to see objects not visible to the unaided eye. Therefore, it does not serve as a comprehensive summary of the text.

The rest of this explanation is for members. Sign in free to read why the other options are wrong, key words and tips.

Sign in to read the full explanation

With a free account: Retry and compare every attempt.
Saving...